M4.2 Earthquake 78 km W of Ollagüe, Chile — July 21, 2026
2026-07-21 17:09:54 UTC (3 hours ago) · approx. 12:09 PM UTC-5 local
On July 21, 2026 at 17:09 UTC, a magnitude 4.2 intermediate depth earthquake struck 78 km W of Ollagüe, Chile, at a depth of 114.4 km and coordinates -21.3290°, -69.0034°.
Physical scale: An earthquake of magnitude 4.2 releases seismic energy equivalent to roughly 30 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 476 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-69.0034°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 4.2 earthquake near Ollagüe, Chile?
The magnitude 4.2 earthquake that struck 78 km W of Ollagüe, Chile on July 21, 2026 at 17:09 UTC had a depth of 114.4 km. For context, this was a light earthquake commonly felt near the epicenter.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.2 earthquakes can continue for several days and gradually diminish over time.
Actions
Location
Understanding This Data
Magnitude 4.2 earthquakes are often felt but rarely cause damage.
Authoritative source: USGS event page (event ID: us7000t28f). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, July 21, 2026). M4.2 Earthquake 78 km W of Ollagüe, Chile — July 21, 2026. Retrieved July 21, 2026 from https://www.earthquaketracker.org/earthquakes/event/us7000t28f/